Good question! I need to make a graphic to properly explain it, but…
When you boot up Tower Unite and you have an existing GMod Tower account, it will prompt you with a conversion window.
From there the converter will match items, awards, etc. that exist in Tower Unite. If an item or award does not exist in Tower Unite, it will credit you the full GMC worth of it, but in Units (the new currency).
As for your GMC, it will transfer into Units. There may be a transaction adjustment, similar to different currencies in real countries, to appropriately scale the value for Tower Unite’s new economy.
The converter will only require user confirmation. It will neatly and graphically show every conversion made.
The conversion will only occur once per account.